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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Numerical Cognition

Background:

  • Spatial and numerical information processing show significant interactions from birth.
  • Larger numbers correlate with larger spatial extents and rightward locations, while smaller numbers correlate with smaller extents and leftward locations.
  • These number-space mappings are often attributed to a mental number line, but evidence for a unified representational object is limited.

Purpose of the Study:

  • To investigate the interaction between number/location and number/spatial extent congruency effects.
  • To determine if these two mappings originate from a single representational object.
  • To examine the influence of number format (symbolic vs. non-symbolic) on this interaction.

Main Methods:

  • Two experiments were conducted with adult participants.
  • Investigated congruency effects between number/location and number/spatial extent.
  • Employed both symbolic and non-symbolic number presentation formats within implicit numerical tasks.

Main Results:

  • A significant interaction was observed between number/location and number/spatial extent mappings.
  • This interaction was specific to the context of an implicit numerical task.
  • The format of number presentation (symbolic or non-symbolic) did not affect the observed interaction.

Conclusions:

  • Number/location and number/spatial extent mappings can indeed stem from the activation of a single representational object.
  • This unified representation is evident under specific experimental conditions, such as implicit numerical tasks.
  • The findings suggest a more integrated cognitive system for processing numerical and spatial information than previously demonstrated.